Have you tried using Parameters as a a way to filter data of both datasets?
Also using an action for a heavy dataset might not be the easiest way to do it.
Can you try and use the actual filters?
If you don't know how to use parameters, please let me know and I'll try to place parameters toyout viz.
I may be missing something, but does adding a second target filter for the other datasource produce the behavior you want?
I tried to use parameter once when it was under the same dashboard and it works, but I could not find how to do it to another dashboards. Thank you for your help!
Perfect!! This is exactly what I want. Thank you so much!